EP3617123A1 - Dispositif et procédé d'inspection d'un câble d'ascenseur - Google Patents

Dispositif et procédé d'inspection d'un câble d'ascenseur Download PDF

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Publication number
EP3617123A1
EP3617123A1 EP19194492.5A EP19194492A EP3617123A1 EP 3617123 A1 EP3617123 A1 EP 3617123A1 EP 19194492 A EP19194492 A EP 19194492A EP 3617123 A1 EP3617123 A1 EP 3617123A1
Authority
EP
European Patent Office
Prior art keywords
wear
elevator
rope
camera
location
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19194492.5A
Other languages
German (de)
English (en)
Other versions
EP3617123B1 (fr
Inventor
Mitsuru Kato
Hideki Miyazawa
Yoshiki NOTA
Yusuke Watabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Otis Elevator Co
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Otis Elevator Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd, Otis Elevator Co filed Critical Meidensha Corp
Publication of EP3617123A1 publication Critical patent/EP3617123A1/fr
Application granted granted Critical
Publication of EP3617123B1 publication Critical patent/EP3617123B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00—Other common features of elevators
    • B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
    • B66B7/1207—Checking means
    • B66B7/1215—Checking means specially adapted for ropes or cables
    • B66B7/1238—Checking means specially adapted for ropes or cables by optical techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006—Monitoring devices or performance analysers
    • B66B5/0018—Devices monitoring the operating condition of the elevator system
    • B66B5/0025—Devices monitoring the operating condition of the elevator system for maintenance or repair
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006—Monitoring devices or performance analysers
    • B66B5/0018—Devices monitoring the operating condition of the elevator system
    • B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006—Monitoring devices or performance analysers
    • B66B5/0037—Performance analysers

Definitions

  • the present invention relates to elevator-rope inspection devices and elevator-rope inspection methods. Specifically, the present invention relates to a non-contact technique for inspecting for wear marks in a rope wire, and broken rope wire by processing image data of an elevator rope (hereinafter simply referred to as a rope) captured by a camera, near an elevator hoisting machine, using an analysis device.
  • a rope an elevator rope
  • patent document 1 Disclosed in patent document 1 is "a wire rope wire break inspection device for an elevator and method therefor," so that rope wire breakage does not lead to a strand breakage accident, by inspecting a status of a wire rope wire breakage for an elevator in advance.
  • a wire rope inspection device that analyzes a status of the wire rope using captured images of the wire rope.
  • patent document 4 Disclosed in patent document 4 is "a wire rope inspection device” that continually captures the wire rope and associates the captured images to the wire rope position.
  • Patent document 1 inspects the status of the wire rope wire breakage for an elevator in advance, so that rope wire breakage does not lead to a strand breakage accident.
  • a measurement method of a continuous rope image texture is unclear.
  • the location of wear is detected by implementing a binarization process on captured images.
  • the image-processing unit assigns consecutive numbers to locations of wear when implementing the labeling process and records a coordinate of a position of the location of wear and a region of the location of wear as an amount of wear.
  • the image-processing unit issues a warning when a gap between labels is judged to be a wire break.
  • a line-sensor camera or an area camera is used as the camera.
  • the device further comprises an image-recording unit for recording captured images outputted by the camera.
  • the elevator-rope inspection method according to claim 7 in the present invention for solving the problem comprises a camera for capturing images of one or a plurality of elevator ropes, and an image-processing unit for processing a captured image outputted by the camera, wherein the image-processing unit detects a location of wear by implementing binarization on the captured images, and a labeling process that assigns a label to the location of wear, measures a distance between labels assigned by the labeling process, and when that distance is less than a fixed value, judges that a gap between labels is a wire break.
  • the location of wear is detected by implementing a binarization process on captured images.
  • the image-processing unit assigns consecutive numbers to locations of wear when implementing the labeling process and records a coordinate of a position of the location of wear and a region of the location of wear as an amount of wear.
  • a warning is issued when a gap between labels is judged to be a wire break.
  • a line-sensor camera or an area camera is used as the camera.
  • the method further comprises recording captured images outputted by the camera.
  • an effect is attained of measuring a break in the rope wire even without texture information of the rope in advance.
  • an effect is attained of detecting a region of a worn portion as an amount of wear.
  • the invention issues a warning, attaining an effect of increasing safety.
  • a line-sensor camera capable of high-speed capturing is used as the camera, attaining an effect of being able to capture images even when the elevator is rising or lowering at high speed. Also, by using an area camera capable of measuring color information, it is advantageous in that ex post facto confirmation is easy.
  • an image-recording unit By further constituting an image-recording unit to record captured images outputted by the camera, an effect is attained of making it possible to check captured images when the rope wire breaks, a result of image processing by an image-processing unit.
  • the present invention relates to a camera-type inspection device.
  • the inspection device for wire breakages was attained that does not require obtaining data in advance by measuring a status of wear on a surface of the rope wire using images, and next measuring the breakage of the rope wire using that information.
  • Fig. 1 is a view of an elevator-rope inspection device according to the first embodiment of the present invention.
  • the elevator-rope inspection device in this embodiment is composed of one line-sensor camera 10 that captures a rope R, and a measuring device 20 inputted with captured images outputted by this line-sensor camera 10.
  • Rope R is constituted by spirally winding one or a plurality of strands around a core line; each strand is composed of a plurality of wires.
  • the line-sensor camera 10 shown in Fig. 1 is in a state to capture the rope R near an elevator hoisting machine (not shown in the drawings).
  • the line-sensor camera 10 is a camera capable of high-speed capturing, arranged with a plurality of pixels in a row (one line); a line direction is a horizontal direction, which is a thickness direction of the rope R.
  • the line-sensor camera 10 continually captures the rope R passing by, composes the images in time series, and outputs the composed captured images to the measuring device 20.
  • the one line of images continually captured by the line-sensor camera 10 are one-dimensional, but the captured images composed of the images in one line in time series are two dimensional.
  • the time-series composition may also be implemented by an image-processing unit 22 in the measuring device 20.
  • the elevator-rope inspection device in this embodiment can implement image processing on captured images of the plurality of rope R outputted by the line-sensor camera 10.
  • the line-sensor camera 10 that is capable of high-speed capturing, it is possible to capture images even when the elevator is rising or lowering at high speed.
  • the measuring device 20 is composed of an image-recording unit 21 for recording captured images outputted by the line-sensor camera 10, and an image-processing unit 22 for processing captured images outputted by the line-sensor camera 10.
  • the image-processing unit 22 executes image analysis to inspect for rope wire wear marks and wire breakage.
  • Captured images recorded in the image-recording unit 21 are used when checking for rope wire wear marks and wire breaks, results of image processing by the image-processing unit 22.
  • position and speed detection signals from position and speed detection means 30, are inputted to the measuring device 20 as capture-starting trigger signals
  • position and speed detection signals from the position and speed detection means 30 are inputted to an elevator controller 40.
  • the position and speed detection means 30 is disposed at the elevator hoisting machine.
  • the line-sensor camera 10 starts continuous capturing in sync to the capture-starting trigger signals; captured images outputted by the line-sensor camera 10 are recorded in the image-recording unit 21, and further, an image analysis is started by the image-processing unit 22.
  • a position signal of the elevator from the elevator controller 40 or the like may also be inputted to the measuring device 20 as a capture-starting trigger signal, and the elevator position and camera capturing line may be synchronized. It is possible to use a position of the rope R as the elevator position.
  • the measuring device 20 can be implemented as hardware, but general versatility is improved by installing a predetermined software in a general personal computer. By using a laptop-type personal computer as the personal computer, portability is improved.
  • Rope wire wear is a phenomenon in which a surface of the rope R is scraped while it is being used. If the wear of the wire advances, the wire will break.
  • a portion where wear has advanced is treated as white, and all other areas are black, by the image-processing unit 22 binarizing the image, which is a method for treating images. With this, a state of surface wear on the rope R is measured.
  • Fig. 3 shows binarization of captured images outputted by the line-sensor camera 10, to the measuring device 20;
  • Up and down directions are length directions of the rope R which is a time-series direction.
  • a horizontal direction is a thickness direction of the rope R.
  • a portion that can be seen as white by a surface being scraped through wear is detected a plurality of places as worn locations on the surface of the rope R.
  • the surface of the rope R is regularly uneven because of the spirally wrapped strands.
  • An advancement of wear of the convex portions is comparatively faster than concave portions, so it is thought that the locations of wear are the convex portions. For that reason, a width of each worn location is a thickness of the strand.
  • a surface of the location where the rope wire broke is concave, so metallic reflection is not generated, but is captured comparatively dark in the portion scraped on the surface through wear.
  • the image-processing unit 22 implements a labeling process on previously detected worn locations.
  • a label is assigned to identify detected wear marks.
  • a consecutive number is assigned in order from a top in the drawing, to each location of wear, using label 1, label 2, label 3 and others, and a coordinate that indicates a position of a center of gravity of the location of the wear, and a region of the location of the wear are recorded in each label.
  • a width of the region of the location of wear indicates an amount of wear.
  • a leader line black
  • visual identification is not possible, so a symbols are assigned in text bubbles for each label 1, 2, and 3.
  • FIG. 4 A result of the labeling process in Fig. 3 is shown in Fig. 4 . At this time, it can be seen that a distance between detected labels at locations where a breakage occurred is close.
  • the image-processing unit 22 detects that as a breakage, measures the distance between labels and detects a value of the distance to be a location that does not satisfy a fixed threshold, i.e. less than a fixed value. Conversely, portions whose distance between labels is separated over a fixed threshold are detected as wear marks.
  • the gap between labels 2 and 3 is judged to be a break. If the gap between labels 2 and 3 is higher than the fixed threshold, the gap between labels 2, and 3 is not judged to be a break, but labels 2, and 3 are judged to be wear marks.
  • the fixed threshold is not limited to a thickness of the wire.
  • a plurality of wires can break at the same time.
  • the texture in the rope image is fixed.
  • the gap between labels means the distance between any labels.
  • the distance between labels 2 and 3 that exist at the bottom portion of the rope R was compared, but comparing label 1 that exists at a top portion of the rope R and the distance between labels 2, and 3 that exist at the bottom portion of the rope R to the threshold, if it is higher than the threshold, it is judged that a breakage of the rope wire has not occurred between the label 1 and labels 2, and 3.
  • Step S1 regularly capture a capture pitch of the rope R, by changing the camera capturing cycle, using position information obtained from the elevator controller 40. Continuously capture, regular capturing pitches with the line-sensor camera 10, and input the captured images to the measuring device 20.
  • Step S2 detect an outer circumference of the rope to detect a position of the rope R from the inputted images.
  • the image of the rope R in the drawing is scanned in the horizontal direction; a location that changes from a black portion to a white portion or a location that changes from a white portion to a black portion is the rope external diameter.
  • a surface of the rope R is regularly uneven because of the strands, so a position of the rope R based a thickness of the strands is found.
  • Step S3 implement the binarization process on captured images of the rope R detected from the images.
  • locations where wear is advancing are white; other areas are detected as black. In other words, the white portions are locations of wear.
  • Step S3 assign a label using labeling to locations of wear detected at step S3.
  • Step S4 When labeling, record the region of the location of wear along with the coordinates indicating the position of the center of gravity for the locations of wear, based on the position of the rope R.
  • Step S5 if the distance between labels is less than a fixed threshold, judge it to be a wire break. If it is higher, judge it to be wear marks. (Step S5)
  • Step S5 when it is judged to be a wire break, issue a warning.
  • Step S6 It is possible to implement inspections and maintenance according to the warning, so safety is increased.
  • a speaker (not shown in the drawings) is built into the measuring device 20.
  • Step S7 judge whether capturing of a predetermined length of the rope R or an entire length is completed.
  • Step S8 end all processes.
  • step S9 When capturing is not ended, input newly captured images (step S9), and repeat steps S1 to S6 for all newly captured images.
  • step S1 captured images of the rope R are obtained from the line-sensor camera 10 (step S1), and edge processing is implemented on the obtained captured images (step S2).
  • step S2 edge processing is implemented on the obtained captured images
  • step S3 binarization is implemented on the captured images (step S3), labels are assigned by labeling locations of wear (step S4), and next a wire break of the rope is judged using label information assigned to locations of wear (step S5) to attain the effect of being able to implement an elevator detection device that does not require obtaining data in advance.
  • the line-sensor camera 10 can capture at high speed, so an effect is attained of capturing images even when the elevator is rising and lowering at high speed.
  • step S6 When it is judged that the wire is broken, a warning is issued (step S6), attaining an effect of increasing safety. Furthermore, by further equipping the image-recording unit 21 to record captured images outputted by the line-sensor camera 10, an effect is attained of making it possible to check captured images when the rope wire breaks, a result of image processing by an image-processing unit 22.
  • Fig. 2 is a view of an elevator-rope inspection device according to a second embodiment of the present invention.
  • the elevator-rope inspection device can use the area camera 11 instead of the line-sensor camera 10 used in the first embodiment.
  • the area camera 11 is a camera arranged with a plurality of pixels vertically and horizontally, and can capture two-dimensional images of the stopped rope R with one capture. Captured two-dimensional images are outputted to the measuring device 20 as captured images.
  • the area camera 11 can be used in the same way as the line-sensor camera 10. Also, by using an area camera capable of measuring color information, it is advantageous in that ex post facto confirmation is easy.
  • the present invention has wide industrial applications as an elevator-rope inspection devices and an elevator-rope inspection method.

Landscapes

  • Length Measuring Devices By Optical Means (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
EP19194492.5A 2018-08-29 2019-08-29 Dispositif et procédé d'inspection d'un câble d'ascenseur Active EP3617123B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2018160438A JP7011554B2 (ja) 2018-08-29 2018-08-29 エレベータロープ検査装置及びエレベータロープ検査方法

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EP3617123A1 true EP3617123A1 (fr) 2020-03-04
EP3617123B1 EP3617123B1 (fr) 2022-05-11

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US (1) US20200071130A1 (fr)
EP (1) EP3617123B1 (fr)
JP (1) JP7011554B2 (fr)
CN (1) CN110872037B (fr)

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US20190322489A1 (en) * 2016-11-29 2019-10-24 Meidensha Corporation Elevator rope monitoring device and elevator rope monitoring method
US20200071130A1 (en) * 2018-08-29 2020-03-05 Otis Elevator Company Elevator rope inspection device and method for inspecting an elevator rope
WO2023018336A1 (fr) * 2021-08-11 2023-02-16 Watbots As Procédé de détection de l'usure d'un filet

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US11001474B2 (en) * 2018-01-15 2021-05-11 Otis Elevator Company Wear detection of elevator belt
JP7414189B2 (ja) * 2021-07-21 2024-01-16 三菱電機ビルソリューションズ株式会社 検査装置及びエレベーター装置
WO2024119359A1 (fr) * 2022-12-06 2024-06-13 山东科技大学 Système d'inspection d'état en ligne pour un câble de levage d'ascenseur, et procédé d'inspection pour celui-ci

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JP2009057126A (ja) 2007-08-30 2009-03-19 Graphin Co Ltd エレベータ用ロープの変形検出装置
JP2011107056A (ja) 2009-11-20 2011-06-02 Meidensha Corp ワイヤーロープ検査装置
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US20190322489A1 (en) * 2016-11-29 2019-10-24 Meidensha Corporation Elevator rope monitoring device and elevator rope monitoring method
US11975946B2 (en) * 2016-11-29 2024-05-07 Meidensha Corporation Elevator rope monitoring device and elevator rope monitoring method
US20200071130A1 (en) * 2018-08-29 2020-03-05 Otis Elevator Company Elevator rope inspection device and method for inspecting an elevator rope
WO2023018336A1 (fr) * 2021-08-11 2023-02-16 Watbots As Procédé de détection de l'usure d'un filet
GB2624333A (en) * 2021-08-11 2024-05-15 Watbots As Method for detecting wear of a net

Also Published As

Publication number Publication date
CN110872037B (zh) 2021-10-01
CN110872037A (zh) 2020-03-10
US20200071130A1 (en) 2020-03-05
EP3617123B1 (fr) 2022-05-11
JP2020033137A (ja) 2020-03-05
JP7011554B2 (ja) 2022-01-26

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